​My 15 year old, who has gained about 20 lbs between her 14th and 15th birthday, is trying Low Carb High Fat (LCHF) because it has helped her dad remove himself from the obese category. She has run cross country and spring track for about 3 years but feels her weight is hindering her. She has often been a middle of the group finisher. Her coach is paleo friendly, but when he heard she is trying LCHF, he made a comment that we need to make sure she does not become magnesium deficient. We can monitor her intake of magnesium using an app. Do magnesium needs increase for athletes? Any LCHF runners out there have any input?